Which is the current limit of a usb of a PC?

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xxtigerxx

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i want to supply a device 12V 200mA for the usb.

can i do it?

of course i will use a step up conventer or a charge pump to make 5Volt USB to 12Volts.....


THX
 

Hi,

If I remeber correctly the maximum current limit is about 500mA at 5V, so in ur case assuming no losses Pin = 5 * 500mA = 2.5 Watts
Pout = 12 * 200mA = 2.4 watts

mmm very critical so I would suggest using two usb ports instead of one. I think some of the new usb devices use this way to overcome power limitation

BR
Adel_48
 

Under all conditions you are guaranteed to get 5V @ 100mA, but if you are connected to a PC (connected to the wall outlet) you can negotiate for upto 500mA, but if you are connected to a laptop then it may or may not give you the extra current.

- Jayson
 

The maximum is 500mA, if your application is over the maximum, it should be better to apply by a power supply.
 

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